Firearms extractor-ejector assembly



Feb. 20, 1962 J. H. JOHNSON FIREARMS EXTRACTOR-EJECTOR ASSEMBLY FiledApril 14, 1960 INVENTOR. JAMES H. JOHNSON United States Pate 3,021,634Patented Feb. 20,1962

fiice 3,021,634 FIREARMS EXTRACTOR-EJECTOR ASSEMBLY James H. Johnson,New Haven, Conn., assignor to Olin Mathieson Chemical Corporation, acorporation of Virginia 7 Filed Apr. 14, 1960, Ser. No. 22,156 1 Claim.(Cl. 4225) energizin'g the extractor and the ejector jointly.

An additional feature of the present invention is the provision of ahollow bolt body carrying a movable ejector pin and a claw-typeextractor where both the ejector and extractor are retained within thehollow bolt body by a single coil spring means where the spring is alsouseful to power the extractor and the ejector Without the use ofintermediate instrumentalities.

Firearms embracing certain features of the present invention maycomprise a hollow bolt, a receiver connected to a barrel formed with achamber for receiving a cartridge, said bolt being movable axiallywithin the receiver and having a head adapted to abut a cartridgedisposed in the chamber when the bolt is in a closed position, anejector pin slidably received in a bore formed in the bolt face andmovable into contact with the cartridge, said bolt being further formedwith an aperture operative to receive an extractor element generallydefining a bell crank and terminating at one end in a claw operable toengage the rim of a cartridge and terminating at the opposite end in aknife edge operative to bear upon the bolt head, and a spring meansdisposed within the bolt and maintained under compressive stress so asto drive the ejector element into contact with the cartridge and to urgethe extractor to rotate about said knife edge thereby driving the clawinto firm contact with the cartridge.

Other features and advantages of the present invention will become moreapparent from the succeeding specification when read in conjunction withthe appended drawings in which:

'FIG. 1 is a vertical section of a portion of a firearm disclosing anillustrative embodiment of the ejector-extractor assembly, and,

FIG. 2 is a view similar to FIG. 1 showing the bolt in which a cartridge13- having a rim 14 is disposed.

A hollow, axially reciprocable bolt 16, shown in the normal or closedposition in FIG. 1 and in the open or actuated position of FIG. 2, isformed with a bore 17 terminating at the right end in a bolt head 18. Inwell known fashion the bolt head is formed with a recess or counterboredefining a bolt face 19 operative to engage and make a real contact witha corresponding plane surface 21 formed on the rear of the cartridge 13.

The bolt 16 is formed with an aperture 22 to receive an ejector elementcomprising a pin 23 and a lug 24.

In a generally diametn'c position the bolt 16 is formed with an apertureor a cut-out indicated by the reference 7 numeral 26 receiving anextractor element generally de- In particular, the extractor elementcomprises arm 29 terminating in a claw 28 operative to engage the rim 14of cartridge 13 in well known fashion. The element includes a second arm31 disposed generally perpendicular to the element 29 formed with aknife edge 32 operative to bear upon and pivot about an internal surfaceof the bolt head identified by the reference numeral 33. The bore 17 ofthe hollow bolt 16 carries a coil spring 34 maintained under compressivestress wherein one end of the spring engages a pin 36 carried by thebolt while the opposite end contacts lug 24 formed on the ejectorelement and recess or groove 37 formed in the arm 31 of the extractorelement.

Because of the compressive stress of the spring 34 a constant force isapplied to the ejector and extractor elements tending to drive theseelements in the following fashion. v

The last coil 38 of the spring engages the lug 24 and is operative tourge the ejector 23 to the right from the position of FIG. 1 to theposition shown in FIG. 2 effective to develop acouple about claw 28 toeject a spent cartridge through ejection port 39.

The same coil 38 engages the extractor element at the recess 37 and isthus operative to drive the main body of the extractor in acounterclockwise direction as viewed in FIG. 1 about the knife edge 32.This operation of the spring 34 and the extractor 29' insures firmengagement of the claw 28 with the rim '14 of the cartridge 13 operativeto haul a spent cartridge out of the chamber 12 in conventional fashion.7

Although the extractor element is constantly urged in a counterclockwisedirection about the knife 32, the resilience of the spring 34 poweringthe extractor is sulficient to permit the claw 28 to snap around the rimof a newly chambered cartridge as the bolt is pushed from an openposition to a closed position. The chamfered nose 41 of the clawencounters a corresponding chamfer formed on the rim of the cartridgeand a camming action occurs in well known fashion to permit the claw toswing outwardly in a clockwise direction as viewed in FIG. 1, againstthe torque developed by the spring 34 a sufficient distance to permitthe claw to clear the rim 14 and thereafter snap into the groove 42 tothe position shown in FIG. 1. I

It is anticipated that a wide variety of embodiments of the disclosedejector-extractor assembly may be devised without departing from thespirit and scope of the invention. 7

What is claimed is:

An ejector-extractor assembly comprising a bolt having a bore, anejector pin slidably mounted with the bore, an extractor pivotallymounted upon the bolt and a single means for driving the ejector and theextractor comprising a coil spring having a plurality of turns, saidcoil spring being retained under compression in the bore with theforemost turn thereof being in driving engagement with both the ejectorpin and the extractor, said single turn being operative to drive theejector pin axially and being operative to rotate the extractor aboutanaxis generally perpendicular to the axial path along which the ejectoris driven.

References Cited in the file of this patent UNITED STATES PATENTS495,137 Krnka Apr. 11, 1893 1,140,245 Bubar May 18, 1915 1,790,320Reising Jan. 27, 1931

